The effect of surface roughness on aerodynamic forces and vibrations for a circular cylinder in the critical Reynolds number range

Ma, Wenyong; Liu, Qingkuan; Macdonald, John H G; Yan, Xiu-Juan; Zheng, Yunfei

doi:10.1016/j.jweia.2019.01.011

Cited by 29 publications

(10 citation statements)

References 18 publications

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“…In the context of the present work, the literature has reported studies of surface roughness effect on flow past a bluff body with low frequency [2,5,6,[9][10][11][12][13][14][15][16][17][18][19]. It is important to mention that numerical analysis of rough bluff body aerodynamics near a ground plane is very limited, which valorizes the recent methodology proposed by Alcântara Pereira et al [10] and classified such as "hybrid control technique of vortex shedding" [20].…”

Section: Introductionmentioning

confidence: 99%

“…The present paper aims to contribute with more discussions concerning the surface roughness effect on bluff body aerodynamics. An important practical engineering application of the flow around cylindrical structures is that of the fluid-elastic interaction between the flow and the structure exciting the body into flow-induced vibrations (FIV) [2][3][4][5][6]. Undoubtedly, the surface roughness effect must be used to control this non-linear hydrodynamic phenomenon.…”

Section: Introductionmentioning

confidence: 99%

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Control and Suppression of Vortex Shedding from a Slightly Rough Circular Cylinder by a Discrete Vortex Method

et al. 2020

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A discrete vortex method is implemented with a hybrid control technique of vortex shedding to solve the problem of the two-dimensional flow past a slightly rough circular cylinder in the vicinity of a moving wall. In the present approach, the passive control technique is inspired on the fundamental principle of surface roughness, promoting modifications on the cylinder geometry to affect the vortex shedding formation. A relative roughness size of ε*/d* = 0.001 (ε* is the average roughness and d* is the outer cylinder diameter) is chosen for the test cases. On the other hand, the active control technique uses a wall plane, which runs at the same speed as the free stream velocity to contribute with external energy affecting the fluid flow. The gap-to-diameter varies in the range from h*/d* = 0.05 to 0.80 (h* is the gap between the moving wall and the cylinder bottom). A detailed account of the time history of pressure distributions, simultaneously investigated with the time evolution of forces, Strouhal number behavior, and boundary layer separation are reported at upper-subcritical Reynolds number flows of Re = 1.0 × 105. The saturation state of the numerical simulations is demonstrated through the analysis of the Strouhal number behavior obtained from temporal history of the aerodynamic loads. The present work provides an improvement in the prediction of Strouhal number than other studies no using roughness model. The aerodynamic characteristics of the cylinder, as well as the control of intermittence and complete interruption of von Kármán-type vortex shedding have been better clarified.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Control and Suppression of Vortex Shedding from a Slightly Rough Circular Cylinder by a Discrete Vortex Method

et al. 2020

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“…In the literature, there are traditional works discussing transition to turbulence e.g., [2][3][4][5][6][7][8][9][10], where the surface roughness influence has also been included. The current scope of the research theme about "surface roughness effect" indicates few experimental and numerical studies e.g., [11][12][13][14][15][16][17][18]. The importance of the more relevant works will be discussed throughout the paper.…”

Section: Introductionmentioning

confidence: 99%

Study of Surface Roughness Effect on a Bluff Body—The Formation of Asymmetric Separation Bubbles

2020

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Turbulent flows around bluff bodies are present in a large number of aeronautical, civil, mechanical, naval and oceanic engineering problems and still need comprehension. This paper provides a detailed investigation of turbulent boundary layer flows past a bluff body. The flows are disturbed by superficial roughness effect, one of the most influencing parameters present in engineering applications. A roughness model, recently developed by the authors, is here employed in order to capture the main features of these complex flows. Starting from subcritical Reynolds number simulations (Re = 1.0 × 105), typical phenomena found on critical and supercritical flow regimes are successfully captured, like non-zero lift force and its direction change, drag crisis followed by a gradual increase on this force, and separation and stagnation points displacement. The main contribution of this paper is to present a wide discussion related with the temporal history of aerodynamic loads of a single rough circular cylinder capturing the occurrence of asymmetric separation bubbles generation. The formation of asymmetric separation bubbles is an intrinsic phenomenon of the physical problem, which is successfully reported by our work. Unfortunately, there is a lack of numerical results available in the literature discussing the problem, which has also motivated the present paper. Previous study of our research group has only discussed the drag crisis, without to investigate its gradual increase and the change on lift force direction. Our results again confirm that the Lagrangian vortex method in association with Large-Eddy Simulation (LES) theory enables the development of two-dimensional roughness models.

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“…To artificially shift high-Reynolds-number flow phenomena towards physically low Reynolds numbers, which can still be achieved in wind and water tunnels, surface irregularities-like uniformly distributed dimples and grooves, solid particles, large sheets of glass or sand paper, or span-wise roughness stripes-have been applied in many experimental studies on the aerostatics of 2D circular cylinders in cross-flow, e.g. Güven et al (1980); Achenbach and Heinecke (1981); Ribeiro (1991); Adachi (1997); Yamagishi and Oki (2004); Ma et al (2019). In that way, an artificial transition and an earlier separation of the surface boundary layer could be provoked at lower Reynolds numbers.…”

Section: Closing Remarksmentioning

confidence: 99%

Aerodynamics of smooth and rough square-section prisms at incidence in very high Reynolds-number cross-flows

Hinsberg

2021

Exp Fluids

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The aerodynamics of smooth and slightly rough prisms with square cross-sections and sharp edges is investigated through wind tunnel experiments. Mean and fluctuating forces, the mean pitch moment, Strouhal numbers, the mean surface pressures and the mean wake profiles in the mid-span cross-section of the prism are recorded simultaneously for Reynolds numbers between 1$$\times$$ × 10$$^{5}$$ 5 $$\le$$ ≤ Re$$_{D}$$ D $$\le$$ ≤ 1$$\times$$ × 10$$^{7}$$ 7 . For the smooth prism with $$k_s$$ k s /D = 4$$\times$$ × 10$$^{-5}$$ - 5 , tests were performed at three angles of incidence, i.e. $$\alpha$$ α = 0$$^{\circ }$$ ∘ , −22.5$$^{\circ }$$ ∘ and −45$$^{\circ }$$ ∘ , whereas only both “symmetric” angles were studied for its slightly rough counterpart with $$k_s$$ k s /D = 1$$\times$$ × 10$$^{-3}$$ - 3 . First-time experimental proof is given that, within the accuracy of the data, no significant variation with Reynolds number occurs for all mean and fluctuating aerodynamic coefficients of smooth square prisms up to Reynolds numbers as high as $$\mathcal {O}$$ O (10$$^{7}$$ 7 ). This Reynolds-number independent behaviour applies to the Strouhal number and the wake profile as well. In contrast to what is known from square prisms with rounded edges and circular cylinders, an increase in surface roughness height by a factor 25 on the current sharp-edged square prism does not lead to any notable effects on the surface boundary layer and thus on the prism’s aerodynamics. For both prisms, distinct changes in the aerostatics between the various angles of incidence are seen to take place though. Graphic abstract

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The effect of surface roughness on aerodynamic forces and vibrations for a circular cylinder in the critical Reynolds number range

Cited by 29 publications

References 18 publications

Control and Suppression of Vortex Shedding from a Slightly Rough Circular Cylinder by a Discrete Vortex Method

Control and Suppression of Vortex Shedding from a Slightly Rough Circular Cylinder by a Discrete Vortex Method

Study of Surface Roughness Effect on a Bluff Body—The Formation of Asymmetric Separation Bubbles

Aerodynamics of smooth and rough square-section prisms at incidence in very high Reynolds-number cross-flows

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